摘要:
A diagnosis system, which comprises a monitor, comprising means for detecting multiple reflectance readings in an array of individual locations, means for registering an analytical cartridge in the monitor at a fixed location and orientation relative to the array, and means for determining and displaying analytical results from reflectance readings; and an analytical cartridge, comprising a liquid impervious housing, a sample application site in the housing located outside the monitor when the cartridge is registered in the monitor by the means for registering, one or more reflectance reading sites in the housing that register with one or more of the locations in the array, a capillary pathway in the housing leading from the sample application site to each of the reflectance reading sites, and a reflectance matrix located in at least one of the reflectance reading sites. In some embodiments of the invention, control features that optimize accuracy of measurement by controlling when and if sample reaches reflectance reading sites and by drawing excess sample away from undesirable locations in the cartridge are present. One control element balances the liquid-holding capacities of the application site, the sample-transporting capillary passageway that leads to the reflectance reading site, and the porous matrices from which the reflectance reading will be made, so that excess sample is excluded from entry into the cartridge while sample volumes that are below the minimum necessary for accurate operation do not reach the matrix, thereby avoiding false readings.
摘要:
Un système diagnostique, doté d'un dispositif de contrôle, comprend un dispositif permettant de détecter des lectures de réflectance multiples effectuées dans un ensemble de zones individuelles, un dispositif permettant d'introduire une cartouche d'analyse dans le dispositif de contrôle en un point et selon une orientation fixes par rapport à cet ensemble, ainsi qu'un dispositif permettant de déterminer et d'afficher des résultats d'analyse provenant des lectures de réflectance. Il comprend aussi une cartouche d'analyse munie d'un boîtier étanche aux liquides, d'un site d'application d'échantillon placé dans ce boîtier mais restant hors du dispositif de contrôle lorsque la cartouche y est insérée par le dispositif d'introduction, d'un ou plusieurs sites de lecture de réflectance placés dans le logement et entrant en contact avec une ou plusieurs zones de l'ensemble, d'un conduit capillaire placé dans le boîtier et menant du site d'application d'échantillon à chacun des sites de lecture de réflectance, ainsi que d'une matrice de réflectance placée dans l'un au moins des sites de lecture de réflectance. Dans certaines variantes de l'invention, on trouve des éléments de contrôle optimisant la précision de mesure en contrôlant le moment effectif où les échantillons parviennent aux sites de lecture de réflectance et en évacuant les échantillons surabondants hors des zones critiques de la cartouche. Un élément de contrôle équilibre les capacités en liquide du site d'application, du conduit capillaire acheminant les échantillons au site de lecture de réflectance, et des matrices poreuses sur lesquelles interviendront ces lectures de réflectance, de manière que ces échantillons surabondants ne puissent entrer dans la cartouche, alors que les volumes d'échantillons inférieurs au minimum nécessaire pour un fonctionnement précis ne peuvent parvenir à la matrice, ce qui évite ainsi toute lecture erronée.
摘要:
A microchip laboratory system (10) and method provide fluidic manipulations for a variety of applications, including sample injection for microchip chemical separations. The microchip is fabricated using standard photolithographic procedures and chemical wet etching, with the substrate and cover plate joined using direct bonding. Capillary electrophoresis and electrochomatography are performed in channels (26, 28, 30, 32, 34, 36, 38) formed in the substrate. Analytes are loaded into a four-way intersection of channels by electrokinetically pumping the analyte through the intersection (40), followed by a switching of the potentials to force an analyte plug into the separation channel (34).
摘要:
The present invention is generally directed to improved microfluidic devices (100), systems, and methods of using the same. In particular, the device and systems employ channels (408, 512) having, at least in part, depths that are varied to provide advantageous effects upon the flow rate of fluids in the channel. Typically, microscale channel (408, 512) has an aspect ratio (width/depth) less than or equal to about 1. Variation of the channel depth (408, 512) may be optimized depending upon the nature of the materials to be mixed.
摘要:
Methods and devices are provided for controlling a fluid flow over a sensing surface within a flow cell (200). The methods employ laminar flow techniques to position a fluid flow over one or more discrete sensing areas (260) on the sensing surface of the flow cell. Such methods permit selective sensitization of the discrete sensing areas, and provide selective contact of the discrete sensing areas with a sample fluid flow. Immobilization of a ligand upon the discrete sensing area, followed by selective contact with an analyte contained within the sample fluid flow, allows analysis by a wide variety of techniques. Sensitized sensing surfaces, and sensor devices and systems are also provided.
摘要:
This invention provides an extraction device and method for extracting desired particles from a sample stream (2) containing the desired particles. The device comprises a sample stream inlet (1); an extraction stream inlet (5); an extraction channel (7) in fluid communication with the sample stream inlet (1) and the extraction stream inlet (5) for receiving a sample stream (2) from the sample stream inlet (1) in adjacent laminar flow with an extraction stream (4) from the extraction stream inlet (5); a sequestering material within the extraction channel (7) for capturing desired particles (18) in the extraction stream (9); a by-product stream outlet (15) in fluid communication with the extraction channel (7) for receiving a by-product stream (12) comprising at least a portion of the sample stream (2) from which desired particles (18) have been extracted; and a product outlet (14) in fluid communication with the extraction channel (7) for receiving a product comprising the sequestering material and at least a portion of the desired particles (18).